Make FixedTimeZone isbits (#354)

Co-authored-by: Curtis Vogt <curtis.vogt@gmail.com>

Author: Wynand

Project.toml

@@ -6,6 +6,7 @@ version = "1.6.0"
 [deps]
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 Downloads = "f43a241f-c20a-4ad4-852c-f6b1247861c6"
+InlineStrings = "842dd82b-1e85-43dc-bf29-5d0ee9dffc48"
 LazyArtifacts = "4af54fe1-eca0-43a8-85a7-787d91b784e3"
 Mocking = "78c3b35d-d492-501b-9361-3d52fe80e533"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
@@ -16,6 +17,7 @@ Unicode = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
 
 [compat]
 Downloads = "1"
+InlineStrings = "1.0"
 LazyArtifacts = "1.3"
 Mocking = "0.7"
 RecipesBase = "0.7, 0.8, 1"

src/TimeZones.jl

@@ -5,6 +5,7 @@ using Printf
 using Serialization
 using RecipesBase: RecipesBase, @recipe
 using Unicode
+using InlineStrings: InlineString15
 
 import Dates: TimeZone, UTC
 

src/types/fixedtimezone.jl

@@ -30,7 +30,7 @@ const FIXED_TIME_ZONE_REGEX = r"""
 A `TimeZone` with a constant offset for all of time.
 """
 struct FixedTimeZone <: TimeZone
-    name::String
+    name::InlineString15
     offset::UTCOffset
 end
 
@@ -95,3 +95,4 @@ end
 
 name(tz::FixedTimeZone) = tz.name
 rename(tz::FixedTimeZone, name::AbstractString) = FixedTimeZone(name, tz.offset)
+

test/types/fixedtimezone.jl

@@ -1,4 +1,6 @@
 @testset "FixedTimeZone" begin
+    @test isbitstype(FixedTimeZone)
+
     @test FixedTimeZone("0123") == FixedTimeZone("UTC+01:23", 4980)
     @test FixedTimeZone("+0123") == FixedTimeZone("UTC+01:23", 4980)
     @test FixedTimeZone("-0123") == FixedTimeZone("UTC-01:23", -4980)